Radiopaque intraluminal stent

• US 8,430,923 B2
• Filed: 04/18/2007
• Issued: 04/30/2013
• Est. Priority Date: 03/24/2000
• Status: Expired due to Fees

• Current Assignee: Abbott Cardiovascular Systems Incorporated (Abbott Laboratories)
• Original Assignee: Abbott Cardiovascular Systems Incorporated (Abbott Laboratories)
• Inventors: Pacetti, Stephen, Kramer, Pamela A.
• Primary Examiner(s): Bui, Vy Q
• Application Number:
  US11/736,979
• Publication Number:
  US 20070185564A1
• Time in Patent Office: 2,204 Days
• Field of Search: 623 11- 122, 606191-198
• US Class Current: 623/1.15
• CPC Class Codes: A61F 2/91 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
• CPC Class Codes: A61F 2/92 Stents in the form of a rolled-up sheet expanding after insertion into the vessel , e.g. with a spiral shape in cross-section
• CPC Class Codes: A61L 31/022 Metals or alloys
• CPC Class Codes: A61L 31/18 Materials at least partially X-ray or laser opaque
• CPC Class Codes: Y10T 29/5185 Tube making

Abstract

The present invention includes a radiopaque stent comprising a cylindrical main body. The tubular main body comprises a cobalt chromium alloy that comprises cobalt, chromium and one or more radiopaque materials.

Claims

1. A method for making a radiopaque stent, comprising:

forming a tube from a cobalt chromium alloy that comprises cobalt, chromium and one or more radiopaque materials, the one or more radiopaque materials being selected from elements with atomic numbers from 56 to 79, the tube having a peripheral exterior surface and an interior surface; and

shaping the tube to form the radiopaque stent such that substantially the entirety of the stent is fabricated from the cobalt chromium alloy including the one or more radiopaque materials, shaping the tube including removing portions of the tube and leaving relatively untouched portions to form the radiopaque stent, the peripheral exterior surface of the relatively untouched portions forming a stent peripheral exterior surface of the radiopaque stent and the interior surface of the relatively untouched portions forming a stent interior surface of the radiopaque stent, wherein the radiopaque stent exhibits an ultimate elongation greater than about 20%.

2. The method of claim 1, wherein the tube is shaped by cutting or etching.

3. The method of claim 1, wherein the tube is cut by a laser.

4. The method of claim 1, and further comprising cleaning the radiopaque stent.

5. The method of claim 1, and further comprising providing a flat stock comprising the cobalt chromium alloy that comprises the cobalt, the chromium and the one or more radiopaque materials;

rolling the flat stock and welding the flat stock to form the tube.

6. The method of claim 1, wherein the tube is shaped by near net shape manufacturing.

7. The method of claim 6, where in the near net shape manufacturing comprises metal injection molding.

8. The method of claim 1, wherein the one or more radiopaque materials comprise tungsten.

9. A method for positioning a stent in a lumen of a living being, comprising:

providing a radiopaque stent for positioning in a living being, the radiopaque stent having a single cylindrical main body having a peripheral exterior surface and an interior surface, the single cylindrical main body being formed from a processed fully solution annealed rod stock of a cobalt chromium alloy that comprises cobalt, chromium, and one or more radiopaque materials selected from elements with atomic numbers from 56 to 79 and wherein the stent is unexpanded, portions of the processed fully solution annealed rod stock forming the peripheral exterior surface and the interior surface of the single cylindrical main body;

wherein the radiopaque stent exhibits an ultimate elongation greater than about 20%

transporting the radiopaque stent to a lesion site in the lumen wherein the stent is optionally imaged during transport; and

expanding the radiopaque stent to contact the lesion wherein the stent is imaged during or after expanding the radiopaque stent.

10. A method for making a radiopaque stent, comprising:

providing one and only one tube comprising a cobalt chromium alloy that comprises cobalt, chromium and one or more radiopaque materials selected from elements with atomic numbers from 56 to 79, the one and only one tube having a peripheral exterior surface and an interior surface; and

shaping the one and only one tube to form the radiopaque stent, portions of the peripheral exterior surface forming a stent peripheral exterior surface of the radiopaque stent and the interior surface of the portions forming a stent interior surface and forming a longitudinal lumen of the radiopaque stent, wherein the radiopaque stent exhibits an ultimate elongation greater than about 20%.

11. The method of claim 10, wherein the one or more radiopaque materials comprise tungsten.

12. The method of claim 10, further comprising cold drawing the one and only one tube in stages.

13. The method of claim 10, wherein the one and only one tube is shaped by cutting or etching.

14. The method of claim 10, wherein the one and only one tube is cut by a laser.

15. The method of claim 10, further comprising cleaning the radiopaque stent.

16. The method of claim 10, further comprising forming the one and only one tube from an annealed rod stock.

17. The method of claim 16, wherein the annealed rod stock is fully solution annealed.

18. The method of claim 17, further comprising gun-drilling the fully solution annealed rod stock.